Hi,
Currently arm_feature_set is defined in gcc/config/arm/arm-flags as an array of 2 unsigned long. However, the flags stored in these two entries are (signed) int, being combinations of bits set via expression of the form 1 << bitno. This
creates 3 issues:
1) undefined behavior when setting the msb (1 << 31)
2) undefined behavior when storing a flag with msb set (negative int) into one of the unsigned array entries (positive int)
3) waste of space since the top 32 bits of each entry is not used
This patch changes the definition of FL_* macro to be unsigned int by using the form 1U << bitno instead and changes the definition of arm_feature_set to be an array of 2 unsigned (int) entries.
Bootstrapped on arm-linux-gnueabihf targeting Thumb-2 state.
Is this ok for trunk?